Drill for drilling, a method for making a drill for drilling, and a cutting tool

ABSTRACT

A method of making a drill comprising a tip ( 16 ), a shank ( 10 ) and a flute area having chip spaces ( 12, 14 ) formed therein, the drill being substantially completely coated with a hard material, and is characterized by applying an abrasive material to merely the tip ( 16 ) before coating the drill with the hard material. The drill may more particularly be a solid carbide drill.

CONTINUING APPLICATION DATA

[0001] This application is a Continuation-in-Part of InternationalApplication No. PCT/IB00/00122, filed on Feb. 7, 2000 and claimingpriority from Federal Republic of Germany Application No. 199 05 735.4,filed on Feb. 11, 1999. International Application No. PCT/IB00/00122 waspending as of the filing date of this application. The United States wasan elected state in International Application No. PCT/IB00/00122.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The invention relates to a method of making a drill comprising atip, a shank and a flute area having chip spaces formed therein, thedrill being substantially completely coated with a hard material. Theinvention further relates to a drill which can be made by using such amethod.

[0004] The invention relates to a method of making a cutting toolcomprising a body portion and a cutting portion, the cutting tool beingsubstantially completely coated with a hard material. The inventionfurther relates to a cutting tool which can be made by using such amethod.

[0005] 2. Background Information

[0006] The drill may for example be a twist drill or a tapping drill,with at least one cutting area adjacent the drill tip and at least onechip flute for the removal of chips generated by the cutting of anobject.

[0007] This cutting tool may for example be a milling cutter, a reamer,a drill or a tapping drill. In the following description reference ismade to a drill, more particularly a solid carbide drill.

[0008] A drill is often coated with a hard material so as to increasetool life. For this purpose, the coating is applied to the entirecutting edge area of the drill, i.e. to the drill tip and the chip spacearea of the tool. The hard material coating will then result in thedesired wear resistance of the drill.

[0009] In addition to the wear resistance of the drill, it is alsorelevant for its performance how well the chips formed by the cuttingwork done at the drill tip can be removed through the chip spaces. For agood chip flow, the chip spaces must be as smooth as possible. Thisrequirement is met if the hard material coating is applied to thepolished surface of the drill. In this case the coating also exhibitsvery low roughness, so that the desired chip flow is obtained.

[0010] It has been found, however, that the hard material coating doesnot always adhere to the drill to the extent as desired if the polishedsurface of the drill is coated directly. However, it has been possibleto obtain a distinct improvement in adhesion by microblasting thepolished surface of the drill before coating. The microblasting leads toa slight plastic deformation of the border zone of the drill, whichincreases the internal compressive stresses. At the same timemicroblasting causes a distinct reduction in the internal stressgradient in the border zone of the drill processed in this manner.Another effect is that the microtopography is heavily changed. Thischange provides for that a subsequently applied carbide coating shows animproved adhesion to the surface of the drill. This results in the hardmaterial coating exhibiting improved wear characteristics (see article“Einfluβ der Substratbearbeitung auf das Verschleiβverhalten vonbeschichteten Hartmetallwerkzeugen” [title translation: “The influenceof substrate processing on wear characteristics of coated carbidetools”] by Prof. Dr.-Ing. H. K. Tonshoff, Dipl.-Ing. A. Mohlfeld andDipl. Phys. H. Seegers, institute for product engineering and cuttingmachine tools at the University of Hanover, Germany).

[0011] However, a disadvantage resides in that the microblasted surfacehas an increased roughness, so that the coated surface, too, has aroughness greater than that in the case of drills where the hardmaterial coating is applied directly to the polished surface. Theconsequence is thus a higher coefficient of friction, resulting inpoorer chip flow in the chip spaces.

OBJECT AND SUMMARY OF THE INVENTION

[0012] The present invention overcomes this disadvantage bymicroblasting merely the tip before coating the cutting tool, forexample a drill, with the hard material. In this way, good adhesivenessof the coating in the areas where required may be combined with a smoothsurface of the tool and, thus, good chip flow in those areas where thisis required. The entire cutting work is performed in the area of thetip, so that proper adhesiveness of the coating at this location is ofmajor importance. Chip flow is of subordinate significance in the areaof the tip. In the area of the chip spaces, on the other hand, thestresses occurring are much lower than at the tip, so that at thislocation the adhesiveness of the hard material coating on the surfacewhich has not been subjected to this finishing treatment is sufficient.In the area of the chip spaces, however, a low coefficient of frictionis of particular importance, which is ensured by applying the coating tothe tool surface which is not microblasted and is therefore smooth, withthe result that the desired low coefficient of friction is obtained.

[0013] Advantageous further developments of the invention will beapparent from the features of the invention discussed below.

[0014] The above-discussed embodiments of the present invention will bedescribed further hereinbelow. When the word “invention” is used in thisspecification, the word “invention” includes “inventions”, that is theplural of “invention”. By stating “invention”, the Applicant does not inany way admit that the present application does not include more thanone patentably and non-obviously distinct invention, and maintains thatthis application may include more than one patentably and non-obviouslydistinct invention. The Applicant hereby asserts that the disclosure ofthis application may include more than one invention, and, in the eventthat there is more than one invention, that these inventions may bepatentable and non-obvious one with respect to the other.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The invention will be described below with reference to theaccompanying single FIGURE, which shows a cutting tool, specifically adrill, in accordance with the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0016] As an example of a cutting tool in accordance with the inventiona drill will now be described. The method according to the invention andthe structure of the tool according to the invention may however beapplied to any other cutting tools as desired, for example millingcutters, reamers, tapping drills and the like.

[0017] The drill comprises a shank 10 and a flute area having two chipspaces 12, 14 formed therein. At the front end a drill tip 16 is formedwhich covers the area of the main cutting edge 18 of the drill and,starting from the chisel edge of the drill, an area having a length l ofapproximately twice the diameter of the drill.

[0018] The drill is a solid carbide drill. It thus comprises a bindingmetal as substrate, for example, cobalt, nickel and/or iron, with a hardmaterial bound therein, for example, tungsten carbide, titanium carbide,tantalum carbide and/or boron nitride.

[0019] The drill has a polished surface in the area of the chip spaces12, 14 and in the area of the drill tip 16. At first, this drill iscleaned and dried. The drill tip 16 is subsequently microblasted. Thematerial preferably used therefor is corundum 500 (average grain size ofbetween 5 and 50 μm) at a jet pressure of from 0.5 to 5 bars. The drilltip is blasted until a uniformly matt surface is obtained. The drill isthen cleaned using a method as known in the art.

[0020] Finally, at least the cutting edge area of the drill, i.e. thearea of the chip spaces 12, 14 and the drill tip 16, is provided with ahard material physical vapor deposition (PVD) coating. Basically, anyhard material can be used which, firstly, can be applied using PVDmethods and, secondly, is compatible with the carbide used as substrate.Suitable materials for the hard material coating are, for example,titanium aluminum nitride, titanium nitride, boron carbonitride ortitanium carbonitride.

[0021] The microblasting results in an increase in surface roughness.Measurements at the land 20 of the drill have shown a roughness R_(z) inaccordance with DIN 4768 and DIN 4768 T1 (German Industrial Standards)of between 0.7 and 0.8 μm in the areas which had not been microblasted.In the area of the microblasted drill tip 16 the result was a roughnessR_(z) of between 0.9 and 1.0 μm at the land 20. These values are thesame both before and after coating the drill with the hard material PVDcoating.

[0022] To further explain, the microblasting produces an increasedsurface roughness in the microblasted areas. This surface roughness isdetermined by a measuring process according to German IndustrialStandard (DIN) 4768 and DIN 4768 T1. In other words, the determinationprocess, in general, involves detecting five consecutive individualpeaks and corresponding valleys along the surface of a material. Thedistance from the individual peaks to the corresponding valleys is thenmeasured. The distances are then averaged to arrive at an arithmeticmean value R_(z) which represents average surface roughness. Throughthis technique, it is possible to determine, in at least one embodimentof the present invention, a surface roughness of between 0.7 and 0.8 μmfor the surfaces of the drill that are not microblasted. It is furtherpossible to determine a surface roughness of between 0.9 and 1.0 μm forthe surfaces of the drill that are microblasted. These values are thesame both before and after coating the drill with the hard material PVDcoating.

[0023] One feature of the invention resides broadly in a method ofmaking a cutting tool comprising a tip (16), a shank (10) and a flutearea having chip spaces (12, 14) formed therein, the cutting tool beingsubstantially completely coated with a hard material, characterized bymicroblasting merely the tip (16) before coating the cutting tool withthe hard material.

[0024] Another feature of the invention resides broadly in a methodcharacterized in that the step of microblasting the tip (16) covers anarea of approximately twice the diameter of the cutting tool, startingfrom the front end of the cutting tool.

[0025] Yet another feature of the invention resides broadly in a methodcharacterized in that the coating of the cutting tool is performed as aPVD coating.

[0026] Still another feature of the invention resides broadly in amethod characterized in that Al₂O₃ having an average grain size ofbetween about 5 μm and 50 μm is used as the blasting medium for themicroblasting.

[0027] A further feature of the invention resides broadly in a cuttingtool comprising a tip (16), a shank (10) and a flute area having chipspaces (12, 14) formed therein, the tip (16) being microblasted and thecutting tool being substantially completely coated with a hard material.

[0028] Another feature of the invention resides broadly in a cuttingtool characterized in that it is a solid carbide tool.

[0029] Yet another feature of the invention resides broadly in a cuttingtool characterized in that cobalt, nickel and/or iron is used as bindingmetal and tungsten carbide, titanium carbide, tantalum carbide and/orboron nitride is used as hard material bound therein.

[0030] Still another feature of the invention resides broadly in acutting tool characterized in that its surface in the non-microblastedareas is by at least R_(z) 0.2 μm finer than in microblasted areas.

[0031] A further feature of the invention resides broadly in a cuttingtool characterized in that it has a roughness R_(z) of between 0.7 and0.8 μm in the non-microblasted areas and a roughness R_(z) of between0.9 and 1.0 μm in the microblasted areas.

[0032] Another feature of the invention resides broadly in a cuttingtool characterized in that it is a drill.

[0033] Yet another feature of the invention resides broadly in a cuttingtool characterized in that it is a tapping drill.

[0034] Still another feature of the invention resides broadly in acutting tool characterized in that it is a milling cutter.

[0035] A further feature of the invention resides broadly in a cuttingtool characterized in that it is a reamer.

[0036] Another feature of the invention resides broadly in a cuttingtool characterized in that the hard material used as coating is boroncarbonitride, titanium carbonitride, titanium aluminum nitride and/ortitanium nitride.

[0037] The components disclosed in the various publications, disclosedor incorporated by reference herein, may be used in the embodiments ofthe present invention, as well as equivalents thereof.

[0038] The appended drawings in their entirety, including alldimensions, proportions and/or shapes in at least one embodiment of theinvention, are accurate and are hereby included by reference into thisspecification.

[0039] All, or substantially all, of the components and methods of thevarious embodiments may be used with at least one embodiment or all ofthe embodiments, if more than one embodiment is described herein.

[0040] All of the patents, patent applications and publications recitedherein, and in the Declaration attached hereto, are hereby incorporatedby reference as if set forth in their entirety herein.

[0041] The corresponding foreign and international patent publicationapplications, namely, Federal Republic of Germany Application No. 199 05735.4, filed on Feb. 11, 1999, having inventors Bernhard BORSCHERT,Dieter MÜHLFRIEDEL, and Karl-Heinz WENDT, and DE-OS 199 05 735.4, andDE-PS 199 05 735.4, and International Application No. PCT/IB00/00122,filed on Feb. 7, 2000, having inventors Bernhard BORSCHERT, DieterMÜHLFRIEDEL, and Karl-Heinz WENDT, as well as their publishedequivalents, and other equivalents or corresponding applications, ifany, in corresponding cases in the Federal Republic of Germany andelsewhere, and the references and documents cited in any of thedocuments cited herein, such as the patents, patent applications andpublications, are hereby incorporated by reference as if set forth intheir entirety herein.

[0042] All of the references and documents, cited in any of thedocuments cited herein, are hereby incorporated by reference as if setforth in their entirety herein. All of the documents cited herein,referred to in the immediately preceding sentence, include all of thepatents, patent applications and publications cited anywhere in thepresent application.

[0043] The details in the patents, patent applications and publicationsmay be considered to be incorporable, at applicant's option, into theclaims during prosecution as further limitations in the claims topatentably distinguish any amended claims from any applied prior art.

[0044] Some examples of physical vapor deposition (PVD) coating andcutting tools with PVD coatings that may be utilized or adapted for usein at least one possible embodiment of the present invention may befound in the following U.S. patents: U.S. Pat. No. 6,248,408 B1, issuedto Lee on Jun. 19, 2001; U.S. Pat. No. 6,224,972 B1, issued to Nordgrenet al. on May 1, 2001; U.S. Pat. No. 6,210,726 B1, issued to Schiller etal. on Apr. 3, 2001; U.S. Pat. No. 6,174,571 B1, issued to Corderman etal. on Jan. 16, 2001; U.S. Pat. No. 5,981,382, issued to Konecni et al.on Nov. 9, 1999; U.S. Pat. No. 5,364,209, issued to Santhanam et al. onNov. 15, 1994; U.S. Pat. No. 5,252,360, issued to Huttl et al. on Oct.12, 1993; U.S. Pat. No. 5,250,367, issued to Santhanam et al. on Oct. 5,1993; and U.S. Pat. No. 5,087,477, issued to Giggins, Jr. et al. on Feb.11, 1992.

[0045] Some examples of drills with cutters that may be utilized oradapted for use in at least one possible embodiment of the presentinvention may be found in the following U.S. patents: U.S. Pat. No.6,220,795 B1, issued to Matthews on Apr. 24, 2001; U.S. Pat. No.6,213,691 B1, issued to Leeb on Apr. 10, 2001; U.S. Pat. No. 6,095,264,issued to Dillard on Aug. 1, 2000; U.S. Pat. No. 6,059,054, issued toPortwood et al. on May 9, 2000; U.S. Pat. No. 5,909,985, issued to Shigaet al. on Jun. 8, 1999; U.S. Pat. No. 5,518,077, issued to Blackman etal. on May 21, 1996; U.S. Pat. No. 5,161,898, issued to Drake on Nov.10, 1992; U.S. Pat. No. 4,975,290, issued to Lindberg on Jan. 3, 1989;and U.S. Pat. No. 4,412,763, issued to Shallenberger, Jr. on Nov. 1,1983.

[0046] Some examples of microblasting techniques that may be utilized oradapted for use in at least one possible embodiment of the presentinvention may be found in the following U.S. patents: U.S. Pat. No.5,836,765, issued to Hickok on Nov. 17, 1998; U.S. Pat. No. 5,704,787,issued to Hickok et al. on Jan. 6, 1998; and U.S. Pat. No. 5,508,206,issued to Glenn et al. on Apr. 16, 1996.

[0047] Some examples of drills with reamers that may be utilized oradapted for use in at least one possible embodiment of the presentinvention may be found in the following U.S. patents: U.S. Pat. No.5,499,896, issued to Cafarelli on Mar. 19, 1996; U.S. Pat. No.5,390,750, issued to Deken et al. on Feb. 21, 1995; U.S. Pat. No.5,354,155, issued to Adams on Oct. 11, 1994; U.S. Pat. No. 4,815,899,issued to Regan on Mar. 28, 1989; U.S. Pat. No. 4,606,680 issued toStriegl on Aug. 19, 1986; U.S. Pat. No. 4,605,347, issued to Jodock etal. on Aug. 12, 1986; and U.S. Pat. No. 4,507,028, issued to Matsushitaon Mar. 26, 1985.

[0048] Some examples of drills and/or drill bits using cobalt as abinding metal that may be utilized or adapted for use in at least onepossible embodiment of the present invention may be found in thefollowing U.S. patents: U.S. Pat. No. 6,220,117 B1, issued to Butcher onApr. 24, 2001; U.S. Pat. No. 5,740,872, issued to Smith on Apr. 21,1998; and U.S. Pat. No. 5,725,313, issued to Singh et al. on Mar. 10,1998.

[0049] Some examples of drills and/or drill bits using nickel as abinding metal that may be utilized or adapted for use in at least onepossible embodiment of the present invention may be found in thefollowing U.S. patents: U.S. Pat. No. 5,421,425, issued to Griffin onJun. 6, 1995; U.S. Pat. No. 4,506,432, issued to Smith on Mar. 26, 1985;U.S. Pat. No. 4,169,637, issued to Voitas on Oct 2, 1979; and U.S. Pat.No. 4,087,137, issued to Voitas on May 2, 1978.

[0050] Some examples of reamers that may be utilized or adapted for usein at least one possible embodiment of the present invention may befound in the following U.S. patents: U.S. Pat. No. 6,202,768 B1, issuedto Lindgren et al. on Mar. 20, 2001; U.S. Pat. No. 6,112,835, issued toGrafe et al. on Sep. 5, 2000; U.S. Pat. No. 6,076,618, issued to Asbergon Jun. 20, 2000; U.S. Pat. No. 5,551,812, issued to Basteck on Sep. 3,1996; U.S. Pat. No. 5,499,896, issued to Cafarelli on Mar. 19, 1996;U.S. Pat. No. 5,354,155, issued to Adams on Oct. 11, 1994; U.S. Pat. No.5,328,304, issued to Kress et al. on Jul. 12, 1994; U.S. Pat. No.5,238,335, issued to Nomura on Aug. 24, 1993; U.S. Pat. No. 5,217,333,issued to Hunt on Jun. 8, 1993; U.S. Pat. No. 5,190,113, issued toHawrylak on Mar. 2, 1993; U.S. Pat. No. 5,163,790, issued to Vig on Nov.17, 1992; U.S. Pat. No. 5,149,233, issued to Kress et al. on Sep. 22,1992; U.S. Pat. No. 4,936,721, issued to Meyer on Jun. 26, 1990; U.S.Pat. No. 4,795,289, issued to Potemkin on Jan. 3, 1989; U.S. Pat. No.4,792,264, issued to Kress et al. on Dec. 20, 1988; U.S. Pat. No.4,705,435, issued to Christoffel on Nov. 10, 1987; U.S. Pat. No.4,480,704, issued to May et al. on Nov. 6, 1984; U.S. Pat. No.4,452,307, issued to Horton on Jun. 5, 1984; U.S. Pat. No. 4,350,204,issued to Horton on Sep. 21, 1982; U.S. Pat. No. 4,182,425, issued toGarrett on Jan. 8, 1980; U.S. Pat. No. 4,040,765, issued to Vig on Aug.9, 1977; and U.S. Pat. No. 4,014,622, issued to Lotz on Mar. 29, 1977.

[0051] Some examples of drills and/or drill bits using iron as a bindingmetal that may be utilized or adapted for use in at least one possibleembodiment of the present invention may be found in the following U.S.patents: U.S. Pat. No. 6,220,117 B1, issued to Butcher on Apr. 24, 2001and U.S. Pat. No. 4,971,485, issued to Nomura et al. on Nov. 20, 1990.

[0052] Some examples of drills and/or drill bits with tungsten carbidethat may be utilized or adapted for use in at least one possibleembodiment of the present invention may be found in the following U.S.patents: U.S. Pat. No. 6,135,218, issued to Deane et al. on Oct. 24,2000; U.S. Pat. No. 6,029,544, issued to Katayama on Feb. 29, 2000; U.S.Pat. No. 5,979,571, issued to Scott et al. on Nov. 9, 1999; U.S. Pat.No. 5,836,409, issued to Vail, III on Nov. 17, 1998; U.S. Pat. No.4,241,483, issued to Voitas on Dec. 30, 1980; U.S. Pat. No. 4,200,159,issued to Peschel et al. on Apr. 29, 1980; and U.S. Pat. No. 4,169,637,issued to Voitas on Oct. 2, 1979.

[0053] Some examples of drills and/or drill bits with titanium carbidethat may be utilized or adapted for use in at least one possibleembodiment of the present invention may be found in the following U.S.patents: U.S. Pat. No. 5,882,152, issued to Janitzki on Mar. 16, 1999and U.S. Pat. No. 4,211,294, issued to Multakh on Jul. 8, 1980.

[0054] Some examples of drills and/or drill bits with boron nitride thatmay be utilized or adapted for use in at least one possible embodimentof the present invention may be found in the following U.S. patents:U.S. Pat. No. 6,241,036 B1, issued to Lovato et al. on Jun. 5, 2001;U.S. Pat. No. 5,743,346, issued to Flood et al. on Apr. 28, 1998; U.S.Pat. No. 5,154,550, issued to Isobe et al. on Oct. 13, 1992; and U.S.Pat. No. 4,720,371, issued to Shirley on Jan. 19, 1988.

[0055] Some examples of milling cutters that may be utilized or adaptedfor use in at least one possible embodiment of the present invention maybe found in the following U.S. patents: U.S. Pat. No. 6,231,281 B1,issued to Nishikawa on May 15, 2001; U.S. Pat. No. 6,220,795 B1, issuedto Matthews on Apr. 24, 2001; U.S. Pat. No. 6,217,262 B1, issued toWright on Apr. 17, 2001; U.S. Pat. No. 6,176,648 B1, issued to Mizutanion Jan. 23, 2001; U.S. Pat. No. 6,158,927, issued to Cole et al. on Dec.12, 2000; U.S. Pat. No. 6,146,059, issued to Rohr on Nov. 14, 2000; U.S.Pat. No. 6,109,838, issued to Riviere on Aug. 29, 2000; U.S. Pat. No.6,042,308, issued to Schmitt on Mar. 28, 2000; U.S. Pat. No. 5,967,706,issued to Hughes, Jr. on Oct. 19, 1999; U.S. Pat. No. 5,957,628, issuedto Bentjens et al. on Sep. 28, 1999; U.S. Pat. No. 5,934,842, issued toGupta on Aug. 10, 1999; U.S. Pat. No. 5,919,008, issued to Shimomura onJul. 6, 1999; U.S. Pat. No. 5,899,642, issued to Berglöw et al. on May4, 1999; 5,868,529, issued to Rothballer et al. on Feb. 9, 1999; U.S.Pat. No. 5,848,858, issued to Jager et al. on Dec. 15, 1998; U.S. Pat.No. 5,820,308, issued to Hoefler on Oct. 13, 1998; U.S. Pat. No.5,762,452, issued to Mina on Jun. 9, 1998; U.S. Pat. No. 5,672,031,issued to Oles on Sep. 30, 1997; U.S. Pat. No. 5,542,795, issued toMitchell on Aug. 6, 1996; U.S. Pat. No. 5,542,794, issued to Smith etal. on Aug. 6, 1996; U.S. Pat. No. 5,529,439, issued to Werner et al. onJun. 25, 1996; U.S. Pat. No. 4,990,035, issued to Scheuch et al. on Feb.5, 1991; U.S. Pat. No. 4,938,638, issued to Hessman et al. on Jul. 3,1990; U.S. Pat. No. 4,930,949, issued to Giessler on Jun. 5, 1990; U.S.Pat. No. 4,848,978, issued to Keritsis on Jul. 18, 1989; U.S. Pat. No.4,799,838, issued to Kubo et al. on Jan. 24, 1989; U.S. Pat. No.4,789,273, issued to Wiacek et al. on Dec. 6, 1988; U.S. Pat. No.4,729,697, issued to Lacey on Mar. 8, 1988; U.S. Pat. No. 4,728,228,issued to Okunishi et al. on Mar. 1, 1988; U.S. Pat. No. 4,627,771,issued to Kieninger on Dec. 9, 1986; U.S. Pat. No. 4,623,284, issued toGreiff on Nov. 18, 1986; U.S. Pat. No. 4,533,282, issued to Lindlar etal. on Aug. 6, 1985; U.S. Pat. No. 4,519,731, issued to Jester et al. onMay 28, 1985; U.S. Pat. No. 4,493,594, issued to Okada on Jan. 15, 1985;U.S. Pat. No. 4,461,602, issued to Zettl on Jul. 24, 1984; U.S. Pat. No.4,359,299, issued to Sagarian on Nov. 16, 1982; U.S. Pat. No. 4,204,787,issued to McCray et al. on May 27, 1980; U.S. Pat. No. 4,097,174, issuedto Heinlein on Jun. 27, 1978; U.S. Pat. No. 4,093,392, issued to Hopkinson Jun. 6, 1978; U.S. Pat. No. 4,061,076, issued to Robertson on Dec. 6,1977; U.S. Pat. No. 4,050,129, issued to Jester et al. on Sep. 27, 1977;and U.S. Pat. No. 4,050,128, issued to Lange on Sep. 27, 1977.

[0056] DIN (Deutschland Institut Fuer Normung e.V), published by BeuthVerlag, located in Berlin, Germany, is hereby incorporated by referenceas if set forth in its entirety herein.

[0057] The invention as described hereinabove in the context of thepreferred embodiments is not to be taken as limited to all of theprovided details thereof, since modifications and variations thereof maybe made without departing from the spirit and scope of the invention.

What is claimed is:
 1. A drill for drilling, said drill comprising: ashank; said shank being configured to be mounted in a chuck mechanism todrive said drill; a drill body; a tip; said drill body being disposedbetween said shank and said tip; said drill body comprising at least onechip flute which extends longitudinally along the length of the drillbody; said tip comprising at least one cutting edge; said at least onecutting edge being configured to cut into an object to be drilled; saidat least one chip flute being configured to guide chips produced bycutting an object with said at least one cutting edge; said drill bodycomprising a first section disposed adjacent said tip and a secondsection disposed adjacent said shank; said first section, said secondsection, and said tip each comprising at least one surface; said atleast one surface of said tip having a first roughness; said at leastone surface of said first section having a second roughness; said atleast one surface of said second section having a third roughness; saidfirst roughness and said second roughness being greater than said thirdroughness; and each of said at least one surface of said tip, said atleast one surface of said first section, and said at least one surfaceof said second section being coated with a hard material which is harderthan said drill body.
 2. The drill according to claim 1, wherein: saidat least one surface of said tip and said at least one surface of saidfirst section comprise a first plurality of pits; said at least onesurface of said second section comprises a second plurality of pits; andsaid first plurality of pits have an averaged roughness depth that is atleast two-tenths of a micrometer deeper than an averaged roughness depthof said second plurality of pits.
 3. The drill according to claim 2,wherein: said averaged roughness depth of said second plurality of pitsis between seven-tenths and eight-tenths of a micrometer; and saidaveraged roughness depth of said first plurality of pits is betweennine-tenths of a micrometer and one micrometer.
 4. The drill accordingto claim 3, wherein: said drill has a length dimension from said tip tosaid shank; said drill has a diameter dimension transverse to saidlength dimension; and said tip and said first section together cover anarea of said drill which is substantially twice the diameter dimensionin length.
 5. The drill according to claim 4, wherein said drill is asolid carbide drill.
 6. A drill for drilling, said drill comprising: ashank; said shank being configured to be mounted in a chuck mechanism todrive said drill; a drill body; a tip; said drill body being disposedbetween said shank and said tip; said drill body comprising at least onechip flute which extends longitudinally along the length of the drillbody; said tip comprising at least one cutting edge; said at least onecutting edge being configured to cut into an object to be drilled; saidat least one chip flute being configured to guide chips produced bycutting an object with said at least one cutting edge; said drill bodycomprising a first section disposed adjacent said tip and a secondsection disposed adjacent said shank; said first section, said secondsection, and said tip each comprising at least one surface; said atleast one surface of said tip having a first roughness; said at leastone surface of said first section having a second roughness; said atleast one surface of said second section having a third roughness; atleast one of said first roughness and said second roughness beinggreater than said third roughness; and at least one of: said at leastone surface of said tip, and said at least one surface of said firstsection, being coated with a hard material which is harder than saiddrill body.
 7. The drill according to claim 6, wherein each of said atleast one surface of said tip and said at least one surface of saidfirst section is coated with said hard material which is harder thansaid drill body.
 8. The drill according to claim 7, wherein each of saidfirst roughness and said second roughness is greater than said thirdroughness.
 9. The drill according to claim 8, wherein: said at least onesurface of said second section is coated with said hard material whichis harder than said drill body; said at least one surface of said tipand said at least one surface of said first section comprise a firstplurality of pits; said at least one surface of said second sectioncomprises a second plurality of pits; and said first plurality of pitshave an averaged roughness depth that is at least two-tenths of amicrometer deeper than an averaged roughness depth of said secondplurality of pits.
 10. The drill according to claim 9, wherein: saidaveraged roughness depth of said second plurality of pits is betweenseven-tenths and eight-tenths of a micrometer; said averaged roughnessdepth of said first plurality of pits is between nine-tenths of amicrometer and one micrometer; said drill has a length dimension fromsaid tip to said shank; said drill has a diameter dimension transverseto said length dimension; said tip and said first section together coveran area of said drill which is substantially twice the diameterdimension in length; and said drill is a solid carbide drill.
 11. Adrill for drilling, said drill comprising: a shank; said shank beingconfigured to be mounted in a chuck mechanism to drive said drill; adrill body; a tip; said drill body being disposed between said shank andsaid tip; said drill body comprising at least one chip flute whichextends longitudinally along the length of the drill body; said tipcomprising at least one cutting edge; said at least one cutting edgebeing configured to cut into an object to be drilled; said at least onechip flute being configured to guide chips produced by cutting an objectwith said at least one cutting edge; said drill body comprising a firstsection disposed adjacent said tip and a second section disposedadjacent said shank; said first section, said second section, and saidtip each comprising at least one surface; said at least one surface ofsaid tip having a first roughness; said at least one surface of saidfirst section having a second roughness; said at least one surface ofsaid second section having a third roughness; and at least one of saidfirst roughness and said second roughness being greater than said thirdroughness.
 12. The drill according to claim 11, wherein at least one of:said at least one surface of said tip, and said at least one surface ofsaid first section, is coated with a hard material which is harder thansaid drill body.
 13. The drill according to claim 12, wherein each ofsaid first roughness and said second roughness is greater than saidthird roughness.
 14. The drill according to claim 13, wherein each ofsaid at least one surface of said tip and said at least one surface ofsaid first section is coated with said hard material which is harderthan said drill body.
 15. The drill according to claim 14, wherein: saidat least one surface of said second section is coated with said hardmaterial which is harder than said drill body; said at least one surfaceof said tip and said at least one surface of said first section comprisea first plurality of pits; said at least one surface of said secondsection comprises a second plurality of pits; and said first pluralityof pits have an averaged roughness depth that is at least two-tenths ofa micrometer deeper than an averaged roughness depth of said secondplurality of pits.
 16. The drill according to claim 15, wherein: saidaveraged roughness depth of said second plurality of pits is betweenseven-tenths and eight-tenths of a micrometer; said averaged roughnessdepth of said first plurality of pits is between nine-tenths of amicrometer and one micrometer; said drill has a length dimension fromsaid tip to said shank; said drill has a diameter dimension transverseto said length dimension; said tip and said first section together coveran area of said drill which is substantially twice the diameterdimension in length; said drill is a solid carbide drill; and saidaveraged roughness depths are according to DIN
 4768. 17. A method formaking a drill, said drill comprising a shank; said shank beingconfigured to be mounted in a chuck mechanism to drive said drill; adrill body; a tip; said drill body being disposed between said shank andsaid tip; said drill body comprising at least one chip flute whichextends longitudinally along the length of the drill body; said tipcomprising at least one cutting edge; said at least one cutting edgebeing configured to cut into an object to be drilled; said at least onechip flute being configured to guide chips produced by cutting an objectwith said at least one cutting edge; said drill body comprising a firstsection disposed adjacent said tip and a second section disposedadjacent said shank; said first section, said second section, and saidtip each comprising at least one surface; said at least one surface ofsaid tip having a first roughness; said at least one surface of saidfirst section having a second roughness; said at least one surface ofsaid second section having a third roughness; and at least one of saidfirst roughness and said second roughness being greater than said thirdroughness, said method comprising the step of: applying an abrasivematerial to said at least one of: said at least one surface of said tip,and said at least one surface of said first section, to roughen said atleast one of said at least one surface of said tip and said at least onesurface of said first section.
 18. The method of making a drillaccording to claim 17, wherein said abrasive material has an averagegrain size of between approximately five micrometers and fiftymicrometers.
 19. The method of making a drill according to claim 18,wherein at least one of: said at least one surface of said tip, and saidat least one surface of said first section, is coated with a hardmaterial which is harder than said drill body, said method furthercomprises the step of: coating at least one of: said at least onesurface of said tip, and said at least one surface of said firstsection, with said hard material which is harder than said drill body.20. A cutting tool, such as a drill, a tapping drill, a milling cutter,or a reamer, for cutting, said cutting tool comprising: a drivenportion; said driven portion being configured to be mounted on or in aholding mechanism to drive said cutting tool; a tool body portion; acutting portion; said tool body portion being disposed between saiddriven portion and said cutting portion; said cutting portion comprisingat least one cutting edge; said at least one cutting edge beingconfigured to cut into an object to be drilled; said tool body portioncomprising a first section disposed adjacent said cutting portion and asecond section disposed adjacent said driven portion; said firstsection, said second section, and said cutting portion each comprisingat least one surface; said at least one surface of said cutting portionhaving a first roughness; said at least one surface of said firstsection having a second roughness; said at least one surface of saidsecond section having a third roughness; and at least one of said firstroughness and said second roughness being greater than said thirdroughness.